Since everyone's throwing in wide shots, I'll throw one in here just for comparison's sake.
This one's from a Sigma 10-20 at the wide end:
As someone has mentioned earlier on, distortion is inherent in most wide angle lenses. Notice the distortion here at the ends as well.
This one's from a Sigma 10-20 at the wide end:
![2709792999_32fe0dd287.jpg](/proxy.php?image=http%3A%2F%2Ffarm4.static.flickr.com%2F3156%2F2709792999_32fe0dd287.jpg&hash=6f40982dbce7a2b1a4e148d6cdf3741c)
As someone has mentioned earlier on, distortion is inherent in most wide angle lenses. Notice the distortion here at the ends as well.